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Operating Leases - Maturity Analysis of the Annual Undiscounted Cash Flows (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Sep. 30, 2020
Oct. 01, 2019
Sep. 30, 2019
Lessee, Operating Lease, Liability, Payment, Due [Abstract]        
2021 $ 1,075      
2022 4,300      
2023 3,508      
2024 2,383      
2025 2,093      
Thereafter 3,265      
Total lease payments 16,624      
Less: Imputed interest 1,811      
Total operating lease liabilities $ 14,813 $ 15,333 $ 16,000 $ 16,028